IBM 3803 Manual

Magnetic tape subsystems subsystem description

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Reference manual (206 pages)

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Table of Contents
Section 1: Introduction
Basic Subsystem
3420 Tape Unit
Automatic Threading
IBM Easy Load Cartridge
Sense Bytes
Tape Transport
Read Back Checking
Full-Width Erasure
File Protection
Rewinding
3420 Models 4, 6, and 8
Recording Methods
6250 Bpi
800 BPI, Nine-Track NRZI
Seven-Track
Interblock Gaps
Magnetic Tape and Reels
Figure 1. Subsystem Characteristics
3803 Model 2 Tape Control
General Characteristics
Addressing
Metering
Enable/Disable Switch
Figure 2. 3803 Model 2 and 3420 Configurations
Power On/Off Sequencing
3803 Model 2 Features
Nine-Track NRZI
Seven-Track
Figure 3. Density Feature Combinations
Two-Channel Switch
Device Switch
Figure 4. Two-Channel Switch
Control Switch
Figure 5. Switching Configurations (Part 1 of 2)
Sense Byte
Figure 5. Switching Configurations (Part 2 of 2)
Sense Byte
Section 2: Commands and Instructions
Commands
Figure 6. 3803-2/3420 Commands
Burst Commands
Write
Read Forward
Read Backward
Sense
Sense Reserve
Sense Release
Request Track-In-Error (Request TIE)
Loop Write-To-Read (LWR)
Set Diagnose
Motion Control Commands
Rewind (REW)
Rewind/Unload (RUN)
Erase Gap (ERG)
Write Tape Mark (WTM)
Backspace Block (BSB)
Backspace File (BSF)
Forward Space Block (FSB)
Forward Space File (FSF)
Data Security Erase (DSE)
Non-Motion Control Commands
Operation (NOP)
Mode Set 1 (MS 1)
Mode Set 2 (MS 2)
Diagnostic Mode Set (DMS)
1/0 Instructions
Test 1/0
Halt 1/0
Section 3: Subsystem Operator Functions
Inserting Tape Reel in Cartridge
Load Procedure
Figure 7. Inserting Tape Reel in Cartridge
Figure 8. Load Procedure
Unload Procedure
Operating Procedures after Failure
Tape Fails to Thread (with Cartridge)
Tape Fails to Thread (Without Cartridge)
End of Tape Comes off Machine Reel) Hub as Tape Loads in Columns
Tape Threads Successfully but Fails to Load in Columns
Window Fails to Open after Unload Operation
Channel Fails to Select Tape Unit (Device Switching or Two-Channel Switch Feature Installed)
3420 Indicators and Pushbuttons
Figure 9. 3420 Indicators and Pushbuttons
3803 Operator's Panel
Toggle Switches
Enable/Disable Switch(Es)
Power On/Off Procedures
Power off
Figure 10. 3803 Operator's Panel
Power on
Section 4: Status and Sense Information 3
Status Byte
Sense Byte 0 (Unit Check)
Sense Byte 1
Sense Byte 2 (Track in Error)
Sense Byte 3 (Data and Equipment Checks)
Sense Byte 4
Sense Byte 5
Sense Byte 6 (Tape Unit)
Sense Byte 7 (Tape Unit Ready-Drop Source)
Sense Byte 8 (Microprogram Detected Errors)
Sense Byte 9
Sense Byte 10
Sense Byte 11 (MAL 1 ROS/MP Errors)
Sense Byte 12 (MAL 2 ROS/MP Errors)
Sense Byte 13
Sense Byte 13, Bits 2-7 and Sense Byte 14 (Tape Control Identification)
Sense Byte 15 and 16 (Tape Unit Identification - Serial Number)
Sense Byte 17 (Tape Control Features)
Sense Byte 18
Sense Byte 21 (Thread and Load Diagnostics)
Sense Byte 22 (Field Replaceable Unit Identification)
Sense Byte 23 (Field Replaceable Unit Identification)
Section 5: Error Recovery Procedures
Tape Cleaner Sequence
Operator Messages
Action Requirements
Terminal Action la (with Operator Option)
Terminal Action Lb (Without Operator Option)
Action II (Unit Check)
Action III (Intervention Required)
Action IV (Bus out Check)
Action V (Data Check on Read or Read Backward)
Action VI (Data Check on Write and Write Tape Mark)
Action VII (Overrun, Channel Data Check Chaining Check)
Action VIII (Data Check on Control)
Action IX (Not Capable)
Action X (Equipment Check, no Previous Sense Bits On)
Action XI (Data Security Erase)
Action XII (Load Point, Program Check, Protection Check, Incorrect Length)
Action XIV (ID Burst Check on Write and Write Tape Mark)
Supplementary Information
Index

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GA32-0021 -1

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